win32, ...: avoid including windows.h

Include the most specific header documented by MSDN instead.

src/win32/Com.hxx

@@ -21,8 +21,8 @@
 #define MPD_WIN32_COM_HXX
 
 #include "HResult.hxx"
-#include <objbase.h>
-#include <windows.h>
+
+#include <combaseapi.h>
 
 // RAII for Microsoft Component Object Model(COM)
 // https://docs.microsoft.com/en-us/windows/win32/api/_com/

src/win32/ComHeapPtr.hxx

@@ -23,7 +23,8 @@
 #include <cstddef>
 #include <objbase.h>
 #include <utility>
-#include <windows.h>
+
+#include <combaseapi.h>
 
 // RAII for CoTaskMemAlloc and CoTaskMemFree
 // https://docs.microsoft.com/zh-tw/windows/win32/api/combaseapi/nf-combaseapi-cotaskmemalloc

src/win32/ComPtr.hxx

@@ -21,10 +21,12 @@
 #define MPD_WIN32_COMPTR_HXX
 
 #include "win32/HResult.hxx"
+
 #include <cstddef>
 #include <objbase.h>
 #include <utility>
-#include <windows.h>
+
+#include <combaseapi.h>
 
 // RAII for Object in Microsoft Component Object Model(COM)
 // https://docs.microsoft.com/zh-tw/windows/win32/api/_com/

src/win32/ComWorker.hxx

@@ -26,8 +26,6 @@
 
 #include <boost/lockfree/spsc_queue.hpp>
 
-#include <windows.h>
-
 // Worker thread for all COM operation
 class COMWorker {
 	Thread thread{BIND_THIS_METHOD(Work)};

src/win32/WinEvent.hxx

@@ -20,7 +20,10 @@
 #ifndef MPD_WIN32_WINEVENT_HXX
 #define MPD_WIN32_WINEVENT_HXX
 
-#include <windows.h>
+#include <handleapi.h>
+#include <synchapi.h>
+#include <windef.h> // for HWND (needed by winbase.h)
+#include <winbase.h> // for INFINITE
 
 // RAII for Windows unnamed event object
 // https://docs.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-createeventw